bug#31546: 27.0.50; macOS child frames with no mode-line mouse click problem

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Fri, 1 Jun 2018 23:35:09 -0700
> Cc: Eli Zaretskii <eliz@gnu.org>, martin rudalics <rudalics@gmx.at>, 
> 31546@debbugs.gnu.org
> 
> Here is an updated patch which includes Alan's changes. Any concerns with 
> this?

Fine with me, but please put a comment here:

> -      (bottom (if (window-minibuffer-p start-window)
> +      (bottom (if (or (window-minibuffer-p start-window)
> +                         (not mode-line-format))   <<<<<<<<<<<<<<<<<<<
>                    (nth 3 bounds)
>                  ;; Don't count the mode line.
>                  (1- (nth 3 bounds))))

explaining that a frequent use case without a mode line is child-frame
windows.

Thanks.